Hollow fireproof door.



H. P. A. A. EIOHMANN.

HOLLOW FIREPROOF DOOR.

APPLICATION FILED APR. 23, 1909.

Patented 001;. 4, 191(1 {Mm/r01? 1 ATTORNEY H. P. A. A. EIOHMANN.

HOLLOW FIRBPROOF DOOR. APPLICATION FILED APR. 23, 1909.

Patented Oct. 4, 1910.

4 SHEETS-SHEET 2.

'Illllllrlll.

rlllluln WITNESSES H. P. A. A. EIGHMANN. HOLLOW FIREPRQOF DOOR. APPLICATION FILED APR. 23, 1909.

Patented Oct. 4, 1910.

4 SHBETSSHEET 3.

ATTONE;

Illlllllllkllllllll I WITNESSES '9. ad W H. P. A. A. EICHMANN.

HOLLOW FIREPROOF DOOR. .APPLIOATION FILED APR. 23, 1909.

972,102. r Patented 0013.4,1910.

UNITED, STATES PATENT OFFICE.

HENRY P.. A. A. EICHMANN, OF CORONA, NEW YORK, ASSIGNOR 0F ONE-HALF T0 CHARLES F. LEHMAN, OF CORONA, NEW YORK.

HOLLOW rmnrnoor noon.

Specification of Letters Patent.

Patented Oct. 4, 1910.

Application filed April 23, 1909. Serial No. 491,720.

T 0 all whom. it may concern:

lie it known that l. llnsuv l. A. Enni- .uaxx, a citizen of the United States of America, residing at torona, borough of Queens, city of New York, in the county of Queens and State of New York, have invented certain new and useful Improvements in Hollow Fireproof Doors. of which the following is a sl'KClilCtlllfill, reference being had therein to the accompanying drawing.

This invention relates to hollow metal doors for buildings. houses and the like. Heretofore doors of this kind have been built up of metal sections joined together by folding and interlocking their edges aided by screws and bolts and other fastening devices. I

The object of my efforts is to produce a more rigid, strong and durable door of 1115 kind which will be less liable to collapse or sag and which can be constructed at less expense and without the use of solder, screws, bolts or rivets.

To this end myinuention consists in the peculiar features and combinations of parts more fully described hereinafter and pointed out in the claims.

Figure l is a detail view of a panel half. Fig. 2, a stile member. Fig. 3, a rail half. Fig. 4, a keybrace. Fig. 5, an intermediate rail-half. Figs. 6, T. and 8, views of lock and hinge devices. brace in process of going into loose position. Fig. 10 shows the key-brace in loose position, and the opposite rail member going loosely into place. Fig. 11 is a diagrammatic view showing the manner in which the rail and panel members are loosely placed for the application of pressure. Figs. '12 and '13. show horizontal sections through line a: w and y 1 of Fig. 15. Fig. 14:, a perspective view partly in section and cut away to better show the stile, rail and panel connections, and Fig.

15, a front elevation of the flnished door.

The reference numerals 1 and 2 denote respectively the left and right hand door stiles,

each of which is formed out of a single sheet of metal. To these stiles are secured top and bottom hollow sheet metal rails 3 and 4: with hollow panels 5 and brace-rails 6 inter vening. In the right hand stile 2 are formed two countersinks 20 stamped or otherwise Fig. 9 shows the key-- I depressed to receive the wing. of an ordinary butt. hinge and so that the latter will lie flush with the outer surface of the stile when it is fastened in place by the screw bolts 21. The depressing of the metal to form the countersiuk 20 leaves a transverse wall or' web 22 duplicate sheet metal halves provided at its four surrounding edges with foldable flanges adapted to be firstplaced, as seen in Fig. 11, in position to be afterward folded down, interlocked and rigidly interclenched by means of dies 28 shown in dotted lines, so that when the compressing operation is finished the parts will lie in the relative position seen in Figs. l2, l3. and 14:. To still further add strength and stability to the door, I employ what. will for convenience be called a bracekey 11, because it serves both as a key to lock the edges of the sections together and as a, brace to hold apart the two sheet metal halves which compose each rail, panel and brace section.

7,71'epresent the two halves composing the rail members 3 and 4.

The numerals 8, 8 (Fig. 14) denote two duplicate shells constituting the panel halves. The two braces (3 are each also composed of two duplicate shells having integral locking flanges 6 at their edges which interlock with the stiles at their ends and with the panel halves.

As seen in Fig. 14, the edges of the top attaching flanges of the rail halves 7, where stantially C-shaped in cross-section and passing over and embracing these four assembled hook-shaped flanges. It will be seen by reference to Fig. 14 that the key braces 11 unite the opposite panel pieces, as 7, 7 or 8, 8, to m ch other and also to the stiles, by means of their side flangesll and that they also unite the inturned ed e flanges, as those designated 10" of panel section 7, at their ends, by means of the flange 11- at the ends of the key braces, which interlock with flanges 10 of the panel sections. The vertical attaching flanges of the panels 5 and brace-rails 6 are likewise joined to the stiles 1 and 2. When all of the folds of metal at said seams or joints are pressed and clenched together,

all interstices within are pressed out'and closed, thereby producing a lim1- nated stifl and permanent seam. which clenches all the sections together and which acts like a solid integral rib of metal to prevent the door from sagging or warping either laterally or vertically, as well as to increase its power to resist heat in case of fire, and severe strains and stresses.

vIt should be understood that'suitable mandrels, not shown, are inserted within the hollow members before the outside clenching pressure by the dies is brought to bear on the seams. The result of suchpressure on the peculiarly formed and assembled edges coils the two sheets simultaneously,thereby tightening and stiffening the metal sheets after the manner of tightening a drum head. It will be noticed that flush joints 15, where the ends of the rails and braces are secured to the stiles, contain five folds of metal including the vertically placed brace-key 11 which spans the gap 16 (Fig. 13) between the op posite sides of the door to still further brace and tie the joint rigidly against collapsing inwardly or spreading outwardly.

The bottom. of the lower rail 4 (Figs. 10, 13 and 14) is closed by a sliding sheet metal closure 17 positely facing hook-shaped edges 18 struck up out of its own metal like the other interlocking edges, and which engage corresponding formations 19 along the inside edges of the opposite halves 7, 7 of the rail. The top rail 3-is closed along the upper edge in the same way.

a Although l have called the elongated web 11 which connects and braces the opposite sides of the hollow'door along the seams, a

, key-brace it may not necessarily perform the function of a l ey,.but might be applied to interiorly connect the opposite sides of the door without the'key effect. One of its principal functions is to stiffen the door at the seams both longitudinally and transversely by tying the opposite sheets of the door against spreading apart or against coming together, and to ad( lateral rigidity to the and interloc said stile and red flan rovided with longitudinal op-- whole structure. When all the several sheets 1. In a sheet metal door composed of panel,

stile and rail sections, the combination with said rails and stiles, of pliable flanges alon the edges of the latter and around the pane recess, a pair of panel members having corresponding liable flanges adapted to engage es, and an interior bracekey having a longitudinal opening which receives said other members whereby the key embraces the latter and serves to stiffen and brace the joint.

2. In a sheet metal door composed of hollow panel, stile and rail sections, the combination with said sections, of liable interlocking integral flanges, panel halves provided with corresponding pliable flanges, and a substantially C-shaped internal pliable key-brace, whereby when ressed to ether said flanges andkey will f drm a sti ening and strengthening joint and rib in the door.

3. A sheet metal door composed of anel, stile and rail portions having integra pliable flanges which project into the panel recess, in combination with a panel composed of twoduplicate halves com osing the front and back of the panel, Integral pliable flanges on the edges of said halves arran ed and adapted to interlock those on the ot ier members whereby pressure brdught to bear on all the loosely assembled flanges rigidly clenches the flanges, stretches said halves, and sets the panel permanently in the door.

4. A hollow sheet metal door composed of stile, rail and panel sections interiorly secured together at their contiguous edges by integral interlocking flanges constituting seams, in combination with an interior crossbrace composed of an elongated web of metal which connects the interior opposite sides of the door.

5. A hollow metal door composed of the usual stile, panel and rail sections, in combination with seams formed out of the inter-- clenched conti uous edges of said sections, and a longitudinal interior cross-web connecting the opposite sides of the door at the seams.

6. A-hollow sheet metal rail lock, said recess metal door having a hollow member re essed to receive a being formed by slitting the meini to leans pliable win 's or lips which are i'ehiml or doubled. lnuiumrd upon the. interior of the main sheet to form reinforcemeni's and perforated to receive fastenii'ig In testimony whereof I aflix my signature v111 presence of two Witnesses.

HENRY P. A. A. EICHMANN.

deviv s, and said metal around the lock re- Witnesses: ("(555 being depiessed to form :1 coui'ifei-sink FRANK PAUL,

for Hie face plate of :1 lock. R. G. DU BOIS. 

